Moved content to wiki
Moved content to wiki

https://github.com/choonkeat/attache-rails/wiki/Upgrading-V2-to-V3
choonkeat/attache_rails,choonkeat/attache-rails,choonkeat/attache_rails,choonkeat/attache-rails,choonkeat/attache-rails,choonkeat/attache_rails